Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
mat duong » mai duong, xuat duong, hai duong
vat dung » va dung, viet dung, xay dung
van dung » van dong, xay dung, tin dung
cong ban » cong bang, cong san, cong tan
ban thai » ban than, ban thi, ban tai
thai cao » tai cao, thoai cac, thuat cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu hach - thanh tung ((((vat dung) OR (mat duong))) or (van dung)) cong ban thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - thanh tung ((((vat dung) OR (mat duong))) OR (van dung)) cong ban thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu hach - thanh tung ((((vat dung) OR (mat duong))) or (van dung)) cong ban thai cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - thanh tung ((((vat dung) OR (mat duong))) or (van dung)) cong ban thai cao*.